Motive-power appliance for sewing machines and the like



D. LUSTIG.

MOTIVE POWER APPLIANCE FOR SEWING MACHINES AND THE LIKE.

APPLICATION FILED JUNE 29,1920.

1,418,007. atented May 30, 1922.

2 SHEETS.SHEET I.

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In Vera/far:

D. LUSTIG.

MOTIVE POWER APPLIANCE FOR SEWING MACHINES AND THE LIKE.

APPLICATION FILED JUNE 29,1920.

41 001 v Patented May 30, 1922.

2 SHEETSSHEET 2.

Fig 3 Jaw/j lu/sfzj "9 Alma UNITED STATES 4 PATENT OFFICE.

DAVID LUSTIG, F PARIS, FRANCE.

. Specification of Letters Patent.

Patented May 30, 1922.

Application filed June129, 1920. Serial No. 392,866.

v To a]! whom it may concern Be it known that I. DAVID Lus'ri'e. a citi- 7Len of the Polish Republic, and residing at Paris, France, have invented certain new and useful Improvements in Motive-Power Appliances for Sewing Machines and the like, of which the following is a specification.

This invention has for its objectto provide for the driving of small machines such as sewing machines. by means of electric motors. The invention relates more particularly to a supporting arrangement for the motor, and to the means for throwing it into and out of operation.

In the construction according to the invention, a small electric motor for drivin the sewing machine or the like, is supporte on a movable column and drives the machine throu h a friction roller, the arrangement being such that the person using the machine can lmpart a movement of displacement to the whole motor equipment, by means of a mechanism such that it .can be operated readily by apedal, this displacement being adapted both to close the circuit of the motor and at the same time to bring the friction roller on the motor shaft into contact with the surface of the driving wheel of the sewing machine or the like, while the reverse movement on release of the pedal, disengages the friction drive and opens the switch in the motor circuit.

In the accompanying drawings Figure 1 shows in elevation part of a sew ing machine and table, with amotor mounted on the supporting device upon the table. and controlled by a treadle.

Figure 2 is. a plan view of the motor and its support.

Figure 3 shows to a larger scale the electric motor and its support in side elevation.

Figure 4 shows the support of Figure 3, partly in vertical section.

Figures 5 and 6 are views showing the motor switch to a larger scale, in two positions, that for breaking the circuit, and that for closing the circuit, respectively.

The supporting device consists of a sta tionary tubular part 1 mounted in a base 2 which is fixed to the table of the machine; in the tubular part 1 fits a'sleeve 3 which can slide therein, and can be fixed at the required height for the initial adjustment of the apparatus with respect to the sewing machine or the like to which it is applied.

For this purpose the tubular part 1 is formed with two vertical slots 4 through which pass two screw bolts 5 rigidly attached to the sleeve 3, and provided with wing nuts 6 by means of which the sleeve 3 can be clamped at any desired height with respect to the fixed tubular part 1.

Inside the sleeve 3 a cylinder 7 fits with slight friction, and the electric motor 14 is mounted on this cylinder. The bottom of the. cylinder is shouldered to accommodate a spring 10 which rests against the base of the sleeve 3, the pressure of this spring being sufficient to hold upwards the cylinder 7 together with the motor 14.

The cylinder 7 has a screw or projection 8 which engages in a helicoidal groove 9 formed in the upper part of the sleeve 3.

At the bottom of the cylinder 7 is attached a hook 11 which is connected by means of a rod or cord 12, to a pedal or treadle 13 which is suitably disposed under the table of the machine. By means of this arrangement, when the pedal 13 is depressed, pulling down the rod 12 in the direction of the arrow Z, Figure 1, the hook 11 and cylinder 7 with the electric motor thereon, are pulled downwardly, and the cylinder 7 sliding in the sleeve 3 is given a helicoidal movement of small amplitude in consequence of the engagement of its projection .8 in the groove 9, this movement serving to turn the axis of the motor from the position YY into the position XX, Figure 2.

The motor is so situated on its support with relation to the driving wheel 17 of the sewing machine 18, that this angular movement from position Y'to position X, brings the friction roller 16 on the motor spindle 15 into frictional driving engagement with the wheel 17.

The downward movement of cylinder 7 v with the motor, which takes place simultaneously with the angular movement, serves to produce the closing of the motor switch. For this purpose the switch 19 is mounted on the casing'of the motor, and the operating lever 20 of this switch has connected to it at 21, a rod 22 which is pivotally connected to a post 23 fixed on the sleeve 3; as will bi; seen, this post remains fixed in relation to the motor except for the movement of the cylinder 7 in sleeve 3. whatever may be the adjustment of sleeve 3 in the support 1. The switch operated by lever 20 is thus always held in the open position, as in Figures 1, 3 and 5, when the motor is in the position of rest along the line YY, Figure 2, but it is thrown into the position for closing the circuit as in Figure 6, when the operator depresses the pedal 13 causing the cylinder 7 with the motor 14 to be lowered,

while the movement of projection 8 in the helicoidal groove 9 turns the axis of the motor into the line X-X, and brings the roller 16 into contact with the driving wheel 17 of the sewing machine 18. r

It will be seen that with this mechanism the closing of the circuit and the moving of the motor into the driving position are effected by the single movement of the operator in depressing the pedal 13; and conversely, as soon as the operator releases the pedal, the spring 10 in pressing up the cylinder 7 and the motor which it carries, also causes the motor axis to be turned from the position X--X into position YY, while the switch is operated to open the motor clrcuit. The operator is thus able, by a very simple movement, to set the sewing machine in motion and to stop it again, for periods as long or as short as may be desired.

It will thus be seen that the mechanism described enables a achine to be driven by a small motor and to be controlled individually in a very simple and economic manner. It avoids the necessit of using any belt or like transmission mec anism or gearing, and renders unnecessary any starting rheostat.

The invention is evidently applicable to any other machine capable of beingdriven by a small motor controlled as above described, and it is not limited in its application to sewing machines.

Although the control of the device by means of a pedal will be the preferable method of control in most cases. yet it will be evident that the pedal may be replaced by a member operated by hand or in any other equivalent manner, in cases where theconditions of operation render this preferable; but the control in all cases will be effected in such a manner as to enable a member such as the rod 12 to be moved for maintaining the motor in operation and in the (lIlVlIlg positlon for as long as 1s desired,

and for enabling it to be released and the motor to be stopped at will.

Having thus described my invention what I- claim as new and desire to secure by Letters Patent is 2- 1. A motor driving device applicable to sewing machines and the like, comprising a motor, a roller for driving purposes on the motor spindle, a support for the motor consisting of two members, the one carrying the motor being capable of slidin movement with respect to the other, guiding means adapted to produce a lateral angular movement of'the motor axis during such slidin movement, a motor-controlling switch with means for opening and closing the same automatically in consequence of the movements in one direction and the other direction respectively of the motor, and mechanism for imparting the movements in one direction and the other to the member carrying the motor, whereby said motor is started and moved into the driving position simultaneously, or is stopped and moved out of the driving position, as required.

2. The combination with a machine having a driving wheel, of a motor, a friction roller on the spindle of said motor adapted to be brought into frictional driving en'- gagement with said wheel, means for supporting the motor in a movable manner on the machine, a motor switch, automatic mechanism adapted to operate said switch to close the same on movement of the motor in one direction, and to open the same on movement of the motor in'the opposite direction, and means for imparting movement to the motor in the two directions, the supporting means and moving means for the motor being such as to bring the friction roller on the motor spindle into engagement with said driving wheel by the same movement which causes the motor switch to be closed, and to bring the said friction roller out of engagement with said driving wheel by the movement which causes the motor switch to be opened.

3. A motor driving device applicable to sewing machines and the like, comprising a motor, a roller for driving purposes on the motor spindle, a support for the motor consisting of two members, the one carrying the motor being capable of sliding movement with respect to the other, guiding means adapted to produce a lateral angular movement of the motor axis during such sliding movement, a spring tending to hold the member carrying the motor in a raised position with respect, to the other member of the support which is normally stationary, a motor-controlling switch with means for opening and closing the same automatically in consequence of the movements in one direction and the other direction respectively of the motor, and mechanism for imparting a downward movement to the movable member of the support against the action of the said spring, such downward movement also bringing the motor into its operative position.

4. A motor driving device applicable to sewing machines and the like, comprising a motor, a roller for driving purposes an the motor spindle, a support for the motor consisting of two members, the one carrying the motor being capable of sliding movement with respect to the other, a projection on the one member and a helicoidal groove in the other member engaged with said projection, adapted to. cause the moving member of the support to turn as it rises and falls respectively upon the fixed member, a controlling switch with means for closing the same automatically on downward movement of the said movable member, and for opening the same automatically on upward movement of the said movable member, and mechanism for imparting downward movement and upward movement respectively to the member carrying the motor, whereby said motor is started and moved into the driving position simultaneously, or is stopped and moved outof the driving position, as required.

5. An electric motor driving device applicable .to machines such as sewing ma chines, the device comprising an electric motor, a member carrying the same, an adjustable but normally stationary support upon which said member carryingithe motor is adapted to slide up and down, a spring adapted normally to sustain said member carrying the motor in its raised position, helicoidal guiding means adapted to impart angular movement to the member carrying the motor as said member rises and falls,

a motor-controlling switch and mechanism adapted to close the same automatically on downward movement, and to open the same spindle of said motor adapted to be brought into one position for driving purposes when the motor is moved downwardly while said switch is closed, but to be brought out of the driving position when the motor is raised again while the switch is opened.

DAVID LUSTIG. 

